Plus 1: The Introductory Coaching System for Maths Success (Power of 2) by David J. Sharp. The book covers basic number work, such as counting forwards and backwards with numbers up to 10, adding and subtracting numbers up to 10, and introducing doubling and halving.
https://www.amazon.co.uk/Plus-Introductory-Coaching-System-Success/dp/0953981215
